What is 18 over 21 in simplest form

The constitution gives congress the power to create federal courts lower than the supreme court higher than the supreme court equal to the supreme court, unaffected by the supreme court.

Which is f(5) for the function –2x2 + 2x - 3?

Evaluate 8j -k+148j−k+14 when j=0.25j=0.25 and k=1k=1.